Before

from typing import Optional

def maxlines(input, numlines=None):
    """
    Trim a string to a maximum number of lines.

    Parameters
    ----------
    input : str
    numlines : Optional[int]
        maximum number of lines

    Returns
    -------
    str
    """
    if numlines is None:
        return input
    return '\n'.join(input.split('\n')[:numlines])

After doc484

from typing import Optional

def maxlines(input, numlines=None):
    # type: (str, Optional[int]) -> str
    """
    Trim a string to a maximum number of lines.

    Parameters
    ----------
    input : str
    numlines : Optional[int]
        maximum number of lines

    Returns
    -------
    str
    """
    if numlines is None:
        return input
    return '\n'.join(input.split('\n')[:numlines])

The file is now properly inspectable by mypy or PyCharm.

Before

from typing import *

def itercount(input, char):
    """
    Iterate over input strings and yield a tuple of the string with `char`
    removed, and the number of occurrences of `char`.

    Parameters
    ----------
    input : Iterable[str]
    char : str
        character to remove and count

    Yields
    ------
    stripped : str
        input string with all occurrences of `char` removed
    count : int
        number of occurrences of `char`
    """
    for x in input:
        yield x.strip(char), x.count(char)

After doc484

from typing import *

def itercount(input, char):
    # type: (Iterable[str], str) -> Iterator[Tuple[str, int]]
    """
    Iterate over input strings and yield a tuple of the string with `char`
    removed, and the number of occurrences of `char`.

    Parameters
    ----------
    input : Iterable[str]
    char : str
        character to remove and count

    Yields
    ------
    stripped : str
        input string with all occurrences of `char` removed
    count : int
        number of occurrences of `char`
    """
    for x in input:
        yield x.strip(char), x.count(char)